C 50^5 ) 
of divers fizes^asalfo Microfcopes jin imicatioo ofthofe of Di^ 
^ini and CampanL And I can tell you^ that he lately fhew'd 
one oif his Micro/copes to the CDuke^ which was judged by 
all much better than any of the beft his Highnefs hath ; and f 
was an eyf-witnefs to thisj that for magnifying, defining, and 
clearnelsj it was found very excellent* The jame day he Iske- 
wife ftiew'd his Highnefs a little ProfpediveGlafs, made ac- 
Gording to Mr. iV^R?^^?;^/ oew Invention $ and though this was 
but the firft^and was not above half a foot long^ it had the fame 
effed: of one of two. He is now making another after the coi> 
ceit of M. Cajjegrain^ though he agrees not with him in making 
convex the little Speculum^ which one looks into through 
theEye glafs, but believes^, the French Author only deviled 
that to difguife as much as was poflible his pretended New In- 
vention^ which he endeavors to make anterior to Mr. ISIervtom 
moft tioble one. For the reft, he thinks he hath found a way 
of making Objects feera right with one only glafs. 
But, to return from this digreflion to our fir ft difcourfejyoii 
may take notice^ that the Aflembly at Signor MagaloUt%\^ ha- 
ving been firft informed by Dr. Francmi of the grounds of th s . 
difpute and of the former Obfervations^he began the fame ex* 
pLerimentsby caufing 2 Pigeons to be bit by a Vipers head 
that had been dead above tea hoursj in fuch a manner that by 
preffing the gums fome of that yellow liquor might drop into 
the w^ound. They both died^ one io 6minutes3 and the other 
in 8 1 and not bging content with this^ with another Vipers 
htadthey poifon'd a Chickenj which died in 10 minutes.There 
appeared afterwards another PigeoHj that had been wounded, 
many hours before, by a dead Vipers Iiead^ but it had been 
dead fo loBg, that tlie liquor, quite dried up io the gums^ wai 
becomeio hardj that for all the fqueefiog of it nothing would 
come to the teeth 5 whence this Pigeon was very we!!: And 
Yyv. Franmi having caufed the ftme bird to be bit again by the 
fame dried head/ic had after a little fluttering with his wiiigSv 
whilft the pain of the biting laftedj no other harm* 
A live Viper then being taken34 Chickens were bit by it one 
aftei? another. The two firft, either beeaufe the hquordid 
not penetrate into the wound, or the blood expelled it, ap- 
pear'd not to have any diftcmper* The ^th lock'd as if it would 
dye prefently ,* but a litde after coming to himfelf he got clear 
off 
